The pre$-$tax cost of debt is $11\%,$ preferred stock costs $14\%,$ and equity costs $15\%.$ What is the weighted average cost of capital assuming a tax rate of $40\%$ and a target capital structure of $40\%$ debt, $20\%$ preferred stock, and $40\%$ equity?

$12\mathrm{.}8\%$

$11\mathrm{.}2\%$

$10\mathrm{.}6\%$

$14\mathrm{.}0\%$

$11\mathrm{.}4\%$